How can I be sure that Kaneki did indeed hack that database? As far as I can see the computer already had the database date accessible or did not have a defense layer as such.
If we are not sure then we would simply use a likely or possibly.
This is literally not sound manipulation, it is just an extension of Kaneki who could say that phrase, he is not manipulating the sound at all and also on the page itself there is no indication of an application similar to this case.
Same case as Kaneki.
This reminds me of
Zagred's case in Black Clover, his body produced alot of mouth shaped stuffs that could talk, but it's not deemed as Sound Manipulation.